申请人:Institutul Oncologic
公开号:US03989703A1
公开(公告)日:1976-11-02
A three-step process is provided for preparing the L,D and DL isomers of N[p-[(2,4-diamino-6-pteridyl)-methyl]N.sup.10 -methylamino}-benzoyl]-glutamic acid. The first step produces: 2,4-diamino-6-hydroxymethyl pteridine by condensation in a buffered aqueous media of 2,3,4,5-tetraminopyrimidine dihydrochloride with the bisulphite addition product of 1,3-dihydroxyacetone in the presence of cysteine as catalyst and using selenium dioxide and a continuous air bubbling as oxidation agents. In the next step, 2,4-diamino-6-halomethylpteridine is obtained by halogenation of the previously obtained 2,4-diamino-6-hydroxymethylpteridine in an inert media with a halogenation agent such as thionyl chloride, in the presence of a basic catalyst such as pyridine or triethylamine. In the third step, N[p-[(2,4-diamino-6-pteridyl)-methyl]-N.sup.10 -methylamino}-benzoyl-]-glutamic acid is produced by condensation of the 2,4-diamino-6-halomethylpteridine with N[p-(N-methylamino)-benzoyl]-glutamic acid at pH 3-4 in an aqueous buffered solution.
提供了一种制备N[p-[(2,4-二氨基-6-哌嗪基)-甲基]N.sup.10-甲基氨基}-苯甲酰]-谷氨酸的L、D和DL异构体的三步过程。第一步通过在缓冲的水介质中,在半胱氨酸存在下,使用亚硒酸二氧化物和连续通气作为氧化剂,将2,3,4,5-四氨基嘧啶二盐酸盐与1,3-二羟基丙酮的亚硫酸氢盐加成物缩合,产生2,4-二氨基-6-羟甲基哌嗪。在下一步中,通过使用卤化剂(如硫酰氯)和碱性催化剂(如吡啶或三乙胺)在惰性介质中卤化先前得到的2,4-二氨基-6-羟甲基哌嗪,得到2,4-二氨基-6-卤甲基哌嗪。在第三步中,通过在水缓冲溶液中,在pH 3-4下,将2,4-二氨基-6-卤甲基哌嗪与N[p-(N-甲基氨基)-苯甲酰]-谷氨酸缩合,制备N[p-[(2,4-二氨基-6-哌嗪基)-甲基]N.sup.10-甲基氨基}-苯甲酰]-谷氨酸。